English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Monogalactosyldiacylglycerol deficiency in Arabidopsis affects pigment composition in the prolamellar body and impairs thylakoid membrane energization and photoprotection in leaves

Aronsson, H., Schöttler, M. A., Kelly, A. A., Sundqvist, C., Doermann, P., Karim, S., et al. (2008). Monogalactosyldiacylglycerol deficiency in Arabidopsis affects pigment composition in the prolamellar body and impairs thylakoid membrane energization and photoprotection in leaves. Plant Physiology, 148(1), 580-592. doi:10.1104/pp.108.123372.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-281B-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-9792-D
Genre: Journal Article

Files

show Files
hide Files
:
Aronsson-2008-Monogalactosyldiacyl.pdf (Any fulltext), 3MB
Name:
Aronsson-2008-Monogalactosyldiacyl.pdf
Description:
-
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Aronsson, H.1, Author
Schöttler, M. A.2, Author              
Kelly, A. A.3, Author              
Sundqvist, C.1, Author
Doermann, P.3, Author              
Karim, S.1, Author
Jarvis, P.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Photosynthesis Research, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753323              
3Plant Lipids, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753347              

Content

show
hide
Free keywords: nadph-protochlorophyllide oxidoreductase photosynthetic electron-transport transit peptide photosystem-ii outer envelope dgd1 mutant chlorophyll fluorescence protein import inner envelope in-vivo
 Abstract: Monogalactosyldiacylglycerol (MGDG) is the major lipid constituent of chloroplast membranes and has been proposed to act directly in several important plastidic processes, particularly during photosynthesis. In this study, the effect of MGDG deficiency, as observed in the monogalactosyldiacylglycerol synthase1-1 (mgd1-1) mutant, on chloroplast protein targeting, phototransformation of pigments, and photosynthetic light reactions was analyzed. The targeting of plastid proteins into or across the envelope, or into the thylakoid membrane, was not different from wild-type in the mgd1 mutant, suggesting that the residual amount of MGDG in mgd1 was sufficient to maintain functional targeting mechanisms. In dark-grown plants, the ratio of bound protochlorophyllide (Pchlide, F656) to free Pchlide (F631) was increased in mgd1 compared to the wild type. Increased levels of the photoconvertible pigment-protein complex (F656), which is photoprotective and suppresses photooxidative damage caused by an excess of free Pchlide, may be an adaptive response to the mgd1 mutation. Leaves of mgd1 suffered from a massively impaired capacity for thermal dissipation of excess light due to an inefficient operation of the xanthophyll cycle; the mutant contained less zeaxanthin and more violaxanthin than wild type after 60 min of high-light exposure and suffered from increased photosystem II photoinhibition. This is attributable to an increased conductivity of the thylakoid membrane at high light intensities, so that the proton motive force is reduced and the thylakoid lumen is less acidic than in wild type. Thus, the pH-dependent activation of the violaxanthin de-epoxidase and of the PsbS protein is impaired.

Details

show
hide
Language(s): eng - English
 Dates: 2008-07-222008
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: ISI:000258947600050
DOI: 10.1104/pp.108.123372
ISSN: 0032-0889 (Print)0032-0889 (Linking)
URI: ://000258947600050http://www.jstor.org/stable/pdfplus/40066201.pdf
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Plant Physiology
  Other : Plant Physiol.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bethesda, Md. : American Society of Plant Biologists
Pages: - Volume / Issue: 148 (1) Sequence Number: - Start / End Page: 580 - 592 Identifier: ISSN: 0032-0889
CoNE: https://pure.mpg.de/cone/journals/resource/991042744294438